diff --git a/tools/interop_matrix/client_matrix.py b/tools/interop_matrix/client_matrix.py
index df15a1303782fefca88a1fdde2f4351817b9f6e9..1084a2fef51b744f62bbc505a5112dabe2003e62 100644
--- a/tools/interop_matrix/client_matrix.py
+++ b/tools/interop_matrix/client_matrix.py
@@ -100,6 +100,7 @@ LANG_RELEASE_MATRIX = {
         ('v1.17.1', ReleaseInfo()),
         ('v1.18.0', ReleaseInfo()),
         ('v1.19.0', ReleaseInfo()),
+        ('v1.20.0', ReleaseInfo()),
     ]),
     'go':
     OrderedDict([
@@ -169,6 +170,7 @@ LANG_RELEASE_MATRIX = {
         ('v1.17.1', ReleaseInfo(testcases_file='python__v1.11.1')),
         ('v1.18.0', ReleaseInfo()),
         ('v1.19.0', ReleaseInfo()),
+        ('v1.20.0', ReleaseInfo()),
     ]),
     'node':
     OrderedDict([
@@ -267,7 +269,8 @@ LANG_RELEASE_MATRIX = {
         ('v1.15.0', ReleaseInfo(testcases_file='csharp__v1.3.9')),
         ('v1.16.0', ReleaseInfo(testcases_file='csharp__v1.3.9')),
         ('v1.17.1', ReleaseInfo(testcases_file='csharp__v1.3.9')),
-        ('v1.18.0', ReleaseInfo()),
-        ('v1.19.0', ReleaseInfo()),
+        ('v1.18.0', ReleaseInfo(testcases_file='csharpcoreclr__v1.18.0')),
+        ('v1.19.0', ReleaseInfo(testcases_file='csharpcoreclr__v1.18.0')),
+        ('v1.20.0', ReleaseInfo()),
     ]),
 }
diff --git a/tools/interop_matrix/testcases/csharp__master b/tools/interop_matrix/testcases/csharp__master
index 9f1cd05b1774034e8dcd1632a018293c3bb93fae..e526b3c1cfdf05c1e08614a4a079ca30aa68c363 100755
--- a/tools/interop_matrix/testcases/csharp__master
+++ b/tools/interop_matrix/testcases/csharp__master
@@ -1,7 +1,7 @@
 #!/bin/bash
 # DO NOT MODIFY
 # This file is generated by run_interop_tests.py/create_testcases.sh
-echo "Testing ${docker_image:=grpc_interop_csharp:71b05977-476b-4e57-9752-dd211c9e3741}"
+echo "Testing ${docker_image:=grpc_interop_csharp:9296f21a-f657-4bb0-82a7-24fc527abcbd}"
 docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/net45 --net=host $docker_image bash -c "mono Grpc.IntegrationTesting.Client.exe --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=large_unary --use_tls=true"
 docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/net45 --net=host $docker_image bash -c "mono Grpc.IntegrationTesting.Client.exe --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=empty_unary --use_tls=true"
 docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/net45 --net=host $docker_image bash -c "mono Grpc.IntegrationTesting.Client.exe --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=ping_pong --use_tls=true"
diff --git a/tools/interop_matrix/testcases/csharpcoreclr__master b/tools/interop_matrix/testcases/csharpcoreclr__master
index 3ca145e4c1164e8215cf9cac1ce0db66a88dc824..e14ec047630da2e56003bb2ca7dabcbe5f5e7b4c 100755
--- a/tools/interop_matrix/testcases/csharpcoreclr__master
+++ b/tools/interop_matrix/testcases/csharpcoreclr__master
@@ -1,22 +1,22 @@
 #!/bin/bash
 # DO NOT MODIFY
 # This file is generated by run_interop_tests.py/create_testcases.sh
-echo "Testing ${docker_image:=grpc_interop_csharpcoreclr:bae17a7e-5450-4781-8982-e82cb89db6dd}"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=large_unary --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=empty_unary --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=ping_pong --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=empty_stream --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=client_streaming --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=server_streaming --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=cancel_after_begin --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=cancel_after_first_response --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=timeout_on_sleeping_server --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=large_unary --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=empty_unary --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=ping_pong --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=empty_stream --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=client_streaming --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=server_streaming --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=cancel_after_begin --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=cancel_after_first_response --use_tls=true"
-docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp1.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=timeout_on_sleeping_server --use_tls=true"
+echo "Testing ${docker_image:=grpc_interop_csharpcoreclr:33395965-11d7-4b12-bcd6-a272d4015207}"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=large_unary --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=empty_unary --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=ping_pong --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=empty_stream --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=client_streaming --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=server_streaming --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=cancel_after_begin --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=cancel_after_first_response --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test.sandbox.googleapis.com --server_port=443 --test_case=timeout_on_sleeping_server --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=large_unary --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=empty_unary --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=ping_pong --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=empty_stream --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=client_streaming --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=server_streaming --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=cancel_after_begin --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=cancel_after_first_response --use_tls=true"
+docker run -i --rm=true -w /var/local/git/grpc/src/csharp/Grpc.IntegrationTesting.Client/bin/Debug/netcoreapp2.1 --net=host $docker_image bash -c "dotnet exec Grpc.IntegrationTesting.Client.dll --server_host=grpc-test4.sandbox.googleapis.com --server_port=443 --test_case=timeout_on_sleeping_server --use_tls=true"